Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebf61b854278b22…

MALICIOUS

PDF

95.7 KB Created: 2021-09-12 08:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4a857e5c24a1b1f071ff6adc5581f2d1 SHA-1: b279c852bbcea7b380efe983ff52e33c6f022f60 SHA-256: 3ebf61b854278b225c77fa06a3742b88ed24881deb91a41250610f82ac3e46c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates a potential for exploiting vulnerabilities or executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gemwishrs.com/ckfinder/stones/files/fowotegemogubixejen.pdf In PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/83873278825.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rijenivirusokugi.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rasus.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xevojuwagotuxu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/49714892217.pdfIn PDF document text
    • https://gameclub.by/uploads/files/70436048830.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tajape.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/61274654432.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/20516819737.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/pinebelemipagutofipajafu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/14074372283.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/wisarakamoloduxipozed.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xusirepebabevevamaj.pdfIn PDF document text
    • https://denimder.org/resimler/files/54868469607.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/65814580507.pdfIn PDF document text
    • http://okvin.org/userfiles/file/zofebudakazimiramekikete.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/fijazuwezivi.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/44728336552.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kewosibikiwawipuliji.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/55479790681.pdfIn PDF document text
    • https://paradigma.bg/uf/file/xanoputujesewujelaram.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/57072163818.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fatogoruxererava.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/89761919279.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/82660679362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+hills+2+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10504 bytes
SHA-256: d697a14af95303fbf28565d9e4db77e69052019ee5482351f64552ba27fae161
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 21960 bytes
SHA-256: 426f88b2dc76a528c1fe30037fb57e89d0f94bfe3b087e99977d9df5949fee0e
font_02_sfnt_off000158d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1